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Cobo Vault Essential and Pro now support using Electrum as a watch-only wallet (for instructions, visit this page). If you would like to use Electrum, please be aware of the following:

Electrum compatibility works both on multi-coin firmware and bitcoin-only firmware.

As Electrum uses non-animated QR codes, a single QR code can carry approximately 8 inputs, 2 outputs, and the corresponding signed transaction information. QR code capacity may be subject to change depending on your screen resolution and camera.

If a QR code can’t be recognized, please use a microSD card for data transmission.

When Cobo Vault Essential or Pro is signing a transaction from Electrum, it automatically checks the change address to ensure the address belongs to you. The display will also highlight the change address so you can manually check it.

MicroSD card transmissions are now enabled for bigger transactions with lots of UTXOs, helping to support current Electrum capability and later also PSBT. We are also proud to announce a Bitcoin-only firmware version for those who want to minimize the codebase. Note that if you switch to V1.1.0 (BTC-Only), you will not be able to switch back to the multicoin version firmware.

Another update we have added to the system is double entry for Passphrase. When you enter a Passphrase hidden wallet, you will be asked to enter your passphrase twice to avoid entering the wrong wallet.

Please be aware that if your device is running V1.0.4 or below, you need to upgrade to V1.0.5 first before you are able to upgrade to later versions. Before you upgrade to V1.0.5, you need to ensure your recovery phrase has been properly recorded, as you will have to enter it again once the upgrade is complete.

As V1.0.5 includes security enhancements, upgrading requires password authorization. You will need to set up Cobo Vault and enter the main page before you can view the upgrade prompt.

You can compile the wallet application layer in Cobo Vault if you would like to verify the authenticity of all upgrade packages yourself. Visit our support pages for more information about our open source hardware wallet application layer code. We have also released the open source device schematic circuit diagram and bill of materials (BOM) for Cobo Vault Essential and Pro. View it on our Github page.